By J. J. Jonas

This quantity is a suite of papers awarded on the overseas Symposium held in Montreal August 1988 as a part of the twenty seventh Annual convention of Metallurgists, co-sponsored through the Canadian metal examine organization, the Canadian non-stop metal Casting learn staff and the Canadian Institute of Mining and Metallurgy. 4 subject components are lined within the displays: (1) casting perform and billet caliber for direct rolling and sizzling charging; (2) temperature equalization tools and kit; (3) floor caliber and sensors and (4) mechanical dealing with of billets for direct rolling and charging.

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Additional resources for Direct Rolling and Hot Charging of Strand Cast Billets. Proceedings of the Metallurgical Society of the Canadian Institute of Mining and Metallurgy

Example text

The question of "defect free" steel must be addressed at this point. It is important to recognize that a defect is something that prevents the product from satisfying the customer's requirements and should not be considered as something which prevents the billet from being technically perfect. The process must produce billets of acceptable quality as well as producing them at the correct rate. In other words, the process must be statistically capable. This can only be accomplished through process control not through inspection.

This could be explained by a more uniform heat extraction in the mould which resulted in a more even shell thickness as revealed by the sulphur prints. The more uniform shell thickness reduced the tendency of the billet to deform in the lower part of the mould (shell-mould non-contact zone) and after exiting the mould. 65 50 DIRECT ROLLING OF STRAND CAST BILLETS 45 The significant reduction of near surface cracks in powder cast billets can be attributed to the better thermal insulation and more uniform heat flux in the mould, due to the powder slag.

DIRECT ROLLING OF STRAND CAST BILLETS 7~~ 635 mm O t T 470 mm 1245 mm -*f 1145 mm 2670 mm Fig. 10. Original assymetric Tee design - EW 660 mm 280 mm Fig. 11. Delta-Tee tundish - EW design Fluid Flow Pattern - No Flow Control In the absence of flow controls, the fluid flow pattern showed very short res time (short circuit flow) for the fluid exiting through the inner strand (No. The results are presented in Table 4. TABLE 4 MINIMUM FLUID RETENTION TIME - NO FLOW CONTROLS Minimum Retention Time (sec) Tundish Design Assymetric-Tee Delta-Tee Tundish Depth (mm) 356 508 Strand No.

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